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To evaluate the value of Cosx upto n terms in its series expansion

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/* To evaluate the value of Cosx */
#include<stdio.h>
#include<math.h>
int main()
{
    int i, n;
    float x, sum, t, x1;
/*n=counting upto n terms in expansion of cosx series*/
    printf("Enter the value of x in degree & n:\n");
    scanf("%f%d", &x, &n);
        x1=x;
/*To convert the angle from degree to Radian*/
    x=x*3.14159/180;
    sum=1;
    t=1;
    for(i=1;i<=(n-1);i++)
    {
        t=-t*x*x/((2*i-1)*2*i);
        sum=sum+t;
    }
    printf("Cos(%f)=%f\n",x1,sum);
    return(0);
}
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